section
  h3(id='res.jsonp') res.jsonp([status|body], [body])
  
  p.
    Send a JSON response with JSONP support. This method is identical
    to <code>res.json()</code> however opts-in to JSONP callback
    support.

  +js.
    res.jsonp(null)
    // => null

    res.jsonp({ user: 'tobi' })
    // => { "user": "tobi" }

    res.jsonp(500, { error: 'message' })
    // => { "error": "message" }

  p.
    By default the JSONP callback name is simply <code>callback</code>,
    however you may alter this with the <a href="#app-settings">jsonp callback name</a>
    setting. The following are some examples of JSONP responses using the same
    code:

  +js.
    // ?callback=foo
    res.jsonp({ user: 'tobi' })
    // => foo({ "user": "tobi" })

    app.set('jsonp callback name', 'cb');

    // ?cb=foo
    res.jsonp(500, { error: 'message' })
    // => foo({ "error": "message" })
    